For the top Yukawa generated from one loop, new scalars and fermions are introduced, which should lead to exotic phenomenology. However, since the only requirement for the new particles is to form the desired loop, the quantum numbers of these particles are not fixed by the mechanism. This means there are many possibilities for the new states and the corresponding phenomenology. We focus on the most intuitive case, where the vector-like fermion has the same quantum numbers as the right-handed top quark and only the neutral light scalar is relevant. Production of \(F\bar{F}\)  pair is expected to be the most relevant one. Each \(F(\bar{F})\)  will then decay to \(t(\bar{t})\)  with a light scalar \(s_\ell \) . If the light scalar is stable, then the final states will be \(t\bar{t}\)  plus missing energy, which is similar to the searches for top squark pair production with stable neutralinos [1]}, [2]}, [3]}, [4]}, [5]}, [6]}. The current results exclude a top squark mass up to 1200 GeV for a 600 GeV neutralino, which is still far from the BM1 with \(M_F=1530\)  GeV and \(m_s=612\)  GeV. However, for BM2 with \(M_F=865\)  GeV and \(m_s=433\)  GeV, it is completely excluded. The bound can be avoided, however, with an additional operator involving the light scalar. For example, if it couples to gluons through a new operator \(s_\ell GG\) , then the final states will become \(t\bar{t}\)  plus jets, where the background is much larger. A similar search has been conducted by the CMS collaboration [7]}, whose results can be reinterpreted to this model as \(M_F>670\)  GeV when \(m_s=100\)  GeV, which is much weaker.
